Inclosed-arc lamp.



O. A. B. HALVORSON, JR.

INGLOSED ARC LAMP.

APPLICATION FILED JUNE 30, 1913.

Patented Mar. 16, 1915.

Witnesses; Inventor;

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THE NORRIS PETERS CO., PHOTOVLITHOY, WASHINGTON. D. c.

CROMWELL A. B. HALVORSON, JR., OF SAUGUS,

MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

INCLOSED-ARC LAMP.

Application filed June 30, 1913.

To all whom it may concern:

Be it known that l, ORoMwnLL A. B. HAIwonsoN, Jr., a citizen of the United States, residing at Saugus, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements lIl Inclosed-Arc Lamps, of which the following is a specification.

My invention has reference to an inclosed arc lamp, and more particularly to a lamp of this character which is adapted to use flaming electrodes from which solidifiable products of combustion are evolved and which when they are deposited on the globe obscure the light and decrease the ethciency of the lamp.

My invention provides a novel form of arc inclosure in which the gases evolved from the are are first caused to circulate in a part of the inclosure above the globe where the solidifiable products are caused to deposit, so that when the gases are returned to the globe, they are so far freed from solidifiable products of combustion that the globe remains substantially free from deposit.

For a fuller understanding of my invention reference may be had to the accompanying drawings in which Figure 1 is a vertical SBCtlOIhOf' a lamp embodying my invention; Fig. 2 1s a bottom plan View of the same on an enlarged scale with the globe removed, and Fig. 3 1s a modification.

In the drawings, 1 is the canopy of the lamp which is supported by the usual insulated hook 2. The bottom of the hood is closed by a plate 3. Two tubes 4 and a are received within openings in the plate 3 and communicate with the chamber formed by the hood, and thus communicate with each other at their upper ends. A bottom plate 5 is suitably secured to the lower ends of the tubes 4. A drum 6 is secured to the outer edge of the bottom plate 5 and is provided at its lower edge with an inwardly extending flange 6 A suitable globe seat 7 in the form of an annular ring is secured to the flange 6 and the globe 8 is seated against the plate 7. In the preferred form of my lamp a cylindrical partition plate 9 1s located within the drum and is of substantially the same height as the drum, one side of the cylinder being internally tangential to one side of the drum 6 and the other side Specification of Letters Patent.

Patented Mar. 16, 1915. Serial No. 776,468.

of the cylinder being located between the lower ends of the tubes 4 and -l so as to form a partition in the drum between the tubes and so that one of the tubes 4 will communicate with the globe through the cylindrical member 9, while the other tube A communicates with the globe through the space between the drum and the inner cylinder. 'ihe upper and lower electrodes are indicated by the reference numerals l0 and 11. 'lhe upper electrode is received within a suitable carbon-holder l2 and passes through a gas cap 13 secured to the top plate 0, while the lower electrode 11 is received within a carbon-holder 14 supported by the carbon carrying rod 15 (big. 2). '1 he upper electrode passes through an economizer 1b which is provided with an upwardly extending cylindrical member 17 secured to the bottom plate 5 of the lamp. 'lhe cylinder 17 is somewhat wider than is necessary to receive the upper electrode so as to form a gas pocket which prevents consumption of the upper electrode above the arc. A cylindrical member 18 surrounds the gas cap 13 and extends above the same to form a support for the operating mechanism.

ln operation the fumes evolved from the arc ascend, and experience has shown that the ascent is biased toward and through the cylindrical member 9, into the tube 4 communicating therewith; the fumes then pass through the chamber formed by the hood 1 and plate 3 through the tube 4, through which the gases descend and enter the globe through the space formed between the drum 6 and the cylindrical member 9. During this circulation, the solidifiable products of combustion in the gases are mostly deposited within the tubes and in the depositing chambers formed by the hood and by the drum 6, and the gases are thus relieved of such products of combustion so that when they are returned to the globe, little, if any, deposit takes place on the portion of the globe through which the light passes.

I have not illustrated the arc lamp mecha nism, as this constitutes no part of my present invention and any well known mechanism for starting and regulating the arc and feeding the electrodes may be employed, though I prefer a mechanism which feeds both electrodes together in such a way that the arc is focused.

It will be seen that my lamp utilizes the hood of the lamp as a part of the circulatory system for the fumes, and that the structure of the circulatory system is extremely simple; the same has been found, in actual operation to be efficient.

While the arrangement shown in Figs. 1 and 2, is preferred on account of the finished aspect which it gives to the lamp, 1 have found that I may dispense with the upper condensing chamber by joining the tubes 4: and 4% at their upper ends by a curved pipe 1, as shown in Fig. 3, and which in this case takes the place of the ordinary hood.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. In an arc lamp, a substantially airtight arc inclosure comprising a transparent or translucent globe surrounding the arc surmounted by a fume receiving and condensing drum freely communicating with the top of the globe, and two metallic tubes communicating with the top of the drum and with each other at their upper ends, and

Copies 0! this patent may be obtained for a partition mounted within said drum be tween the two tubes.

2. In an arc lamp, upper and lower electrodes, a substantially air tight arc inclosure comprising a transparent or translucent globe surrounding the arc surmounted by a drum and two metallic tubes communicating witn the top of said drum and a closed hood for the lamp forming a depositing chamber mounted upon the tops of said tubes and communicating therewith, and a cylinder of less diameter than the drum mounted eccentrically within the drum so as to partition the space within the same, one of the tubes communicating with the globe through the cylinder and the other through the space between the drum and the cylinder, and the upper electrode extending with' in said cylinder.

in witness whereof, I have hereunto set my hand this 27th day of June, 1913.

CROMWELL A. B. HALVORSON, JR. Witnesses:

JOHN A. MCMANUS, Jr., HENRY A. ANDERSEN.

five cents each. by addressing the Commissioner of Patents,

Washington, D. C. 

